I popped out of the shower, sans clothes, sans towel, and beamed over at my Master.
"I'm all clean!" I announced.
He came up behind me, wrapped me in one arm and said gently "Sweetie, you are the kind of dirty that can't be washed off".
Then he bent me over and punched me in the ass until I dripped down my leg.
Now I'm going to need another shower.